svEMG. A, Raw EMG data in a representative subject showing the svEMG elicited by subthreshold TMS recorded in the first dorsal interosseous muscle during grasping (neutral position, black traces; pronation, blue traces; supination, red traces). Seventy-five traces were averaged in each condition. The onset and offset of the svEMG is shown between dotted lines and the area underneath the au_svEMG (see Materials and Methods for detailed description). The horizontal dotted line showed the mean rectified EMG activity 100 ms before TMS artifact. B, Graph shows group data (n = 10). The abscissa shows the grasping posture tested (neutral, pronation, supination) and the ordinate shows the normalized area of the svEMG (see Materials and Methods). C, Graph shows a correlation analysis between MEPs size and the svEMG with responses normalized to the mean value across conditions for each measurement. Error bars indicate SE; *p < 0.05.